Cold-insulating plate and process of obtaining the same.



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OTTO I-IORSTMANN, OF COLOGNE, GERMANY.

COLD-INSULATING PLATE AND PROCESS OF OBTAINING THE SAME.

SPECIFICATION forming part of Letters Patent No. 674,969, dated May 28,1901. Application filed August 27, 1900. Serial No. 28,252. (No model.)

To all whom it may concern..-

Be it known that I, OTTO HORSTMANN, a citizen of the German Empire, anda resident of Cologne, Rhine Province, Germany, have invented certainnew and useful Improvements in Cold-Insulating Plates and Processes ofObtaining the Same; and I do herebydeclare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same.

The present invention relates to an improved cold-insulat-ingmaterialthat is, a material preventing the access of heat to the objectsor contrivances-such as refrigerators, surface coolers,refrigerating-tubes, or the likeon which the same has been applied iuthe form of plates or sheets. This material and the plates or sheetsmade of it possess the property of obtaining, by means of heat, such aplasticity as to be easily formed to any desired shape, said materialreceiving again its original solid consistency as soon as the same iscooled down.

Further, my invention relates also to a process for obtaining-that is,manufacturing-the improved cold-insulating material. The new material,and consequently the plates or sheets formed with it, is composed ofasphaltum, paraffin-oil, (a mixture of paraffin and mineral oil,) andcomminuted or granulated cork. Said new material may be obtained byheating the well-known commercial tar-like product composed of asphaltumand paraffin-oil in a vessel to melt the mixture and then mixing themelted mass in a separate heated vessel with comminuted cork. Theresulting product, after having been thoroughly stirred up during theheating, is then poured in an iron form, the inner surface of which ismoistened with mineral oil. The form, which is preferably provided withparallel sides, possesses an inner height corresponding to the thicknessof the plate or sheet to be obtained. Further, the mass contained in theform is spread out and pressed by means of a smooth roller moistenedwith mineral oil, said roller being moved along the top of the sidewalls of the form. In this Way one obtains a plate of homogeneousconsistency with parallel sides. Now the plate is thrown out of the formon a plane surface covered with cork-d ust. Thereafter the plate coolsdown and is thena solid body, which can be packed up ready for sale.

Supposing that a tube, a tank, or any hollow contrivance is to becovered with the new material in order to be kept cool-that is,protected against the access of heat-a plate of the above-described kindis cut to the right size and heated in a steam heating apparatus. Theplate is heated until the same is soft or plastic enough to be easilybent to the proper shape. Now the surface of the plate which shall comeinto contact with the tube, tank, or the like to be insulated is spreadover with the above-named tar-like product composed of asphaltum andparaffin-oil, and then the plate is applied and fastened tightly on thesaid tube or the like in one or several layers. In order to fix thematerial or plate well on the tube or the like, said material or plateis Wrapped or covered with a bandage of suitable material, whereafterthe latter is painted or treated in the same manner as the usualinsulating materials.

Having thus described my invention, what I claim, and desire to secureby Letters Pat-- cut, is

1. As an article of manufacture a cold-insulating plate adapted to beformed to any desired shape after being heated and to become solid whenthe temperature of same is diminished said plate being composed ofasphaltum, paraffin-oil, that is a mixture of paraffin and mineral oil,and comminuted cork, substantially as set forth.

2. A process ,for obtaining a cold-insulating plate adapted to be formedto any desired shape upon being heated and to become solid after thetemperature of same is diminished consisting in melting by heat thecommercial tar-like product composed of asphaltum and paraffin and amineral oil, mixing the melted mass with comminuted cork, forming theresulting mass into a plate, and allowing said plate to obtain a solidc0nsistency, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of twoWitnesses.

OTTO HORSTMANN.

Witnesses:

CHARLES LE SIMPLE, KARL SOHMETT.

